Control of the quantum spin entanglement with ferromagnetic nanowindow

2022 Fiscal Year Annual Research Report

• Project/Area Number: 20H02178
• Research Institution: Tohoku University
• Principal Investigator: 金井 駿 東北大学, 電気通信研究所, 准教授 (40734546)
• Project Period (FY): 2020-04-01 – 2023-03-31
• Keywords: 量子ビット / 固体中のスピン中心 / 酸化物 / 位相緩和時間 / 量子コヒーレンス

Outline of Annual Research Achievements

固体中のスピン量子ビットの大規模化のための材料探索を行った。材料選定は次の観点から行った。
(1)材料が優れた量子コヒーレンス時間を有する
(2)高度なリソグラフィ技術を利用可能である
(3)高品質なワイドギャップ単結晶材料が入手可能である。
(4)材料規模の大規模化の観点から比較的大口径ウェハが入手可能である。
まず、クラスタ相関展開近似に基づく一般化スケーリング則を導出し、ウェブ上の材料構造データベースから12,000以上の材料について位相緩和時間を求めた。この材料は、第一原理計算でバンドギャップが1 eV以上であり、安定状態にあることがわかっているものに限っている。これらの材料の中から、同位体制御なしで位相緩和時間が1 ms以上の材料が約800材料存在することを明らかにした。そのほとんどがカルコゲナイドまたは酸化物であり、7割程度が酸化物である。これらの中で、商業的に大口径ウェハが入手可能な基板材料を用い、イオン注入後により、実際に孤立欠陥中心を作製することに成功した。熱処理条件を調べる事により、イオン注入後の元素が適切なイオン価数になり、かつクラスタなどの非孤立中心を形成しないような条件を明らかにした。共焦点顕微系を構築し、偏光レーザーによる光学検出磁気共鳴測定系を構築した。偏光レーザーを入射した際の偏光フォトルミネッセンス測定から、スピン状態に依存した発光を観測することに成功した。これは新たな欠陥中心材料のスピン量子状態の光学的初期化に成功したことを意味する。

Research Progress Status

令和4年度が最終年度であるため、記入しない。

Strategy for Future Research Activity

令和4年度が最終年度であるため、記入しない。

Research Products

• [Int'l Joint Research] シカゴ大学/アルゴンヌ国立研究所(米国)
  • Country Name: U.S.A.
  • Counterpart Institution: シカゴ大学/アルゴンヌ国立研究所
• [Journal Article] Thermal stability of non-collinear antiferromagnetic Mn3Sn nanodot (2023)
  • Author(s): Sato Yuma, Takeuchi Yutaro, Yamane Yuta, Yoon Ju-Young, Kanai Shun, Ieda Jun’ichi, Ohno Hideo, Fukami Shunsuke
  • Journal Title: Applied Physics Letters Volume: 122 Pages: 122404(1)-(6)
  • DOI: 10.1063/5.0135709
  • Peer Reviewed
• [Journal Article] A full-stack view of probabilistic computing with p-bits: devices, architectures and algorithms (2023)
  • Author(s): Chowdhury Shuvro, Grimaldi Andrea, Aadit Navid Anjum, Niazi Shaila, Mohseni Masoud, Kanai Shun, Ohno Hideo, Fukami Shunsuke, Theogarajan Luke, Finocchio Giovanni, Datta Supriyo, Camsari Kerem Y.
  • Journal Title: IEEE Journal on Exploratory Solid-State Computational Devices and Circuits Volume: - Pages: -
  • DOI: 10.1109/JXCDC.2023.3256981
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] External-Field-Robust Stochastic Magnetic Tunnel Junctions Using a Free Layer with Synthetic Antiferromagnetic Coupling (2022)
  • Author(s): Kobayashi Keito, Hayakawa Keisuke, Igarashi Junta, Borders William A., Kanai Shun, Ohno Hideo, Fukami Shunsuke
  • Journal Title: Physical Review Applied Volume: 18 Pages: 054085(1)-(9)
  • DOI: 10.1103/PhysRevApplied.18.054085
  • Peer Reviewed / Int'l Joint Research
• [Journal Article] Local bifurcation with spin-transfer torque in superparamagnetic tunnel junctions (2022)
  • Author(s): Funatsu Takuya, Kanai Shun, Ieda Jun’ichi, Fukami Shunsuke, Ohno Hideo
  • Journal Title: Nature Communications Volume: 13 Pages: 4079(1)-(8)
  • DOI: 10.1038/s41467-022-31788-1
  • Peer Reviewed / Open Access
• [Journal Article] Observation of domain structure in non-collinear antiferromagnetic Mn3Sn thin films by magneto-optical Kerr effect (2022)
  • Author(s): Uchimura Tomohiro, Yoon Ju-Young, Sato Yuma, Takeuchi Yutaro, Kanai Shun, Takechi Ryota, Kishi Keisuke, Yamane Yuta, DuttaGupta Samik, Ieda Jun'ichi, Ohno Hideo, Fukami Shunsuke
  • Journal Title: Applied Physics Letters Volume: 120 Pages: 172405(1)-(5)
  • DOI: 10.1063/5.0089355
  • Peer Reviewed
• [Journal Article] Generalized scaling of spin qubit coherence in over 12,000 host materials (2022)
  • Author(s): Kanai Shun, Heremans F. Joseph, Seo Hosung, Wolfowicz Gary, Anderson Christopher P., Sullivan Sean E., Onizhuk Mykyta, Galli Giulia, Awschalom David D., Ohno Hideo
  • Journal Title: Proceedings of the National Academy of Sciences Volume: 119 Pages: e2121808119
  • DOI: 10.1073/pnas.2121808119
  • Peer Reviewed
• [Presentation] Device physics of stochastic magnetic tunnel junction (2023)
  • Author(s): S. Kanai
  • Organizer: 2nd Online RIEC International Workshop on Spintronics, Online
  • Int'l Joint Research / Invited
• [Presentation] Heterogeneous probabilistic computers for optimization and sampling (2023)
  • Author(s): N. A. Aadit, A. Grimaldi, K. Selcuk, K. Kobayashi, Q. Cao, S. Chowdhury, G. Finocchio, S. Kanai, H. Ohno, S. Fukami, and K. Y. Camsari
  • Organizer: 2nd Online RIEC International Workshop on Spintronics, Online
  • Int'l Joint Research / Invited
• [Presentation] Exploring qubit host materials based on generalized scaling of spin coherence (2023)
  • Author(s): S. Kanai
  • Organizer: International Workshop of Spin and Quantum Devices and Materials, Sendai, Japan
  • Int'l Joint Research / Invited
• [Presentation] CMOS + stochastic MTJ: Heterogeneous probabilistic computers for optimization and sampling (2023)
  • Author(s): N. A. Aadit, A. Grimaldi, K. Selcuk, K. Kobayashi, Q. Cao, S. Chowdhury, G. Finocchio, S. Kanai, H. Ohno, S. Fukami, and K. Y. Camsari
  • Organizer: The 11th RIEC International Symposium on Brain Functions and Brain Computer (BFBC2023), Tohoku University, Sendai, Japan + Online
  • Int'l Joint Research / Invited
• [Presentation] CMOS+ stochastic MTJ: Heterogeneous p-computers for energy-based machine learning (2023)
  • Author(s): K. Kobayashi, Q. Cao, N. Singh, K. Selcuk, T. Hu, S. Niazi, N. Aadit, S. Kanai, H. Ohno, S. Fukami, and K. Camsari
  • Organizer: APS March Meeting 2023, Las Vegas, NV, USA
  • Int'l Joint Research
• [Presentation] Determining switching exponents with stochastic magnetic tunnel junctions (2023)
  • Author(s): S. Kanai, T. Funatsu, J. Ieda, S. Fukami, and H. Ohno
  • Organizer: APS March Meeting 2023, Las Vegas, NV, USA
  • Int'l Joint Research
• [Presentation] Sputter-deposited non-collinear antiferromagnetic Mn3Sn thin films with controlled crystal orientation (2023)
  • Author(s): J.-Y. Yoon, Y. Takeuchi, R. Itoh, S. Kanai, S. Fukami, H. Ohno
  • Organizer: 第70回応用物理学会秋季学術講演会, 上智大学四谷キャンパス（東京都千代田区）＋online
  • Invited
• [Presentation] Optical properties of MgO implanted with Ce and Li with different annealing conditions (2023)
  • Author(s): M. Kawahara, Y. Abe, S. Kanai, J. Ishihara, Y. Aoki, M. Kohda, S. Fukami, and H. Ohno
  • Organizer: 第70回応用物理学会秋季学術講演会, 上智大学四谷キャンパス（東京都千代田区）＋online
• [Presentation] Temperature dependence of relaxation time of superparamagnetic tunnel junctions (2023)
  • Author(s): H. Kaneko, R. Ota, K. Kobayashi, S. Kanai, H. Ohno, and S. Fukami,
  • Organizer: 第70回応用物理学会秋季学術講演会, 上智大学四谷キャンパス（東京都千代田区）＋online
• [Presentation] Stochasticity and Bifurcation in Spintronics Device for Probabilistic Computing (2022)
  • Author(s): S. Kanai, T. Funatsu, J. Ieda, S. Fukami, and H. Ohno
  • Organizer: 2022 International Symposium on Nonlinear Theory and Its Applications (NOLTA2022), Online
  • Int'l Joint Research / Invited
• [Presentation] Experiment and theory of superparamagnetic tunnel junction (2022)
  • Author(s): S. Kanai
  • Organizer: IMEC academy symposium, Leuven, Belgium＋Online
  • Int'l Joint Research / Invited
• [Presentation] Chiral-spin rotation of antiferromagnetic Weyl semimetal Mn3Sn by spin-orbit torque (2022)
  • Author(s): Y. Takeuchi, Y. Yamane, J.-Y. Yoon, R. Itoh, R. Takechi, K. Kishi, S. DuttaGupta, S. Kanai, B. Jinnai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: Advanced Technology Institute (ATI) 2nd spintronics workshop, Online
  • Int'l Joint Research / Invited
• [Presentation] Experimental evaluation of simulated quantum annealing with MTJ-augmented p-bits (2022)
  • Author(s): A. Grimaldi, K. Selcuk, N. A. Aadit, K. Kobayashi, Q. Cao, S. Chowdhury, G. Finocchio, S. Kanai, H. Ohno, S. Fukami and K. Y. Camsari
  • Organizer: 68th Annual IEEE International Electron Devices Meeting (IEDM2022), San Francisco, USA + Online
  • Int'l Joint Research
• [Presentation] Thermal stability of non-collinear antiferromagnetic Mn3Sn nanodot (2022)
  • Author(s): Y. Sato, Y. Takeuchi, Y. Yamane, S. Kanai, J. Yoon, J. Ieda, H. Ohno and S. Fukami
  • Organizer: The 67th Annual Conference on Magnetism and Magnetic Materials, Minneapolis, USA + Online
  • Int'l Joint Research
• [Presentation] Annealing temperature dependence of optical properties of Ce doped SiO2 (2022)
  • Author(s): Y. Abe, S. Kanai, M. Kawahara, J. Ishihara, Y. Narita, M. Kohda, S. Fukami, and H. Ohno
  • Organizer: The 6th Symposium for The Core Research Clusters for Materials Science and Spintronics, Online
  • Int'l Joint Research
• [Presentation] Size dependence of thermal stability factor in non-collinear antiferromagnetic Mn3Sn nanodot (2022)
  • Author(s): Y. Sato, Y. Takeuchi, Y. Yamane, J.-Y. Yoon, S. Kanai, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: The 6th Symposium for The Core Research Clusters for Materials Science and Spintronics, Online
  • Int'l Joint Research
• [Presentation] Thickness dependence of anomalous Hall effect in non-collinear antiferromagnetic D019-Mn3Sn epitaxial thin films (2022)
  • Author(s): S. Wakabayashi, Y. Takeuchi, J. -Y. Yoon, Y. Sato, K. Kishi, T. Uchimura, Y. Yamane, S. Kanai, J. Ieda , H. Ohno, and S. Fukami
  • Organizer: The 6th Symposium for The Core Research Clusters for Materials Science and Spintronics, Online
  • Int'l Joint Research
• [Presentation] Insensitivity to the bias voltage in double-free-layer stochastic magnetic tunnel junction (2022)
  • Author(s): R. Ota, K. Kobayashi, K. Hayakawa, S. Kanai, K. Y. Camsari, H. Ohno, and S. Fukami
  • Organizer: The 6th Symposium for The Core Research Clusters for Materials Science and Spintronics, Online
  • Int'l Joint Research
• [Presentation] Domain imaging of an antiferromagnetic Weyl semimetal Mn3Sn thin films by magneto-optical Kerr effect (2022)
  • Author(s): T. Uchimura, J.-Y. Yoon, Y. Sato, Y. Takeuchi, S. Kanai, R. Takechi, K. Kishi, Y. Yaman, S. DuttaGupta, J. Ieda, H. Ohno, and S. Fukami
  • Organizer: The 6th Symposium for The Core Research Clusters for Materials Science and Spintronics, Online
  • Int'l Joint Research
• [Presentation] Electric-field induced collective spin dynamics in nanomagnet revealed by 30-ps single-shot measurements (2022)
  • Author(s): S. Kanai, Y. Nakatani, F. Matsukura, and H. Ohno
  • Organizer: Trends in MAGnetism 2022, Venice, Italy
  • Int'l Joint Research
• [Presentation] Thermal Agitation of Magnetization Dynamics Induced by Electric-field (2022)
  • Author(s): S. Kanai, Y. Nakatani, F. Matsukura, and H. Ohno
  • Organizer: 2022 Joint European Magnetic Symposia (JEMS), Warsaw, Poland + Online
  • Int'l Joint Research
• [Presentation] Magnetic Field Immunity of Stochastic Magnetic Tunnel Junctions with Synthetic Antiferromagnetic Free Layer (2022)
  • Author(s): K. Kobayashi, K. Hayakawa, J. Igarashi, W. A. Borders, S. Kanai, H. Ohno, S. Fukami
  • Organizer: 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022), Okinawa Institute of Science and Technology Graduate University (OIST)
  • Int'l Joint Research
• [Presentation] Memristor controlled mutual synchronization of spin Hall nano-oscillators (2022)
  • Author(s): J. Akerman, M. Zahedinejad, A. A. Awad, H. Fulara, S. Muralidhar, A. Houshang, R. Khymyn, S. Fukami, S. Kanai, H. Ohno
  • Organizer: 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022), Okinawa Institute of Science and Technology Graduate University (OIST)
  • Int'l Joint Research
• [Presentation] Magneto-optical Kerr effect study for non-collinear antiferromagnetic Mn3Sn thin films (2022)
  • Author(s): T. Uchimura, J. Yoon, Y. Sato, Y. Takeuchi, S. Kanai, R. Takechi, K. Kishi, Y. Yamane, S. DuttaGupta, J. Ieda, H. Ohno, S. Fukami
  • Organizer: 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022), Okinawa Institute of Science and Technology Graduate University (OIST)
  • Int'l Joint Research
• [Presentation] Thermal Effect in Electric-field Induced Magnetization Dynamics in a Nanoscale Magnetic Tunnel Junction (2022)
  • Author(s): S. Kanai, Y. Nakatani, F. Matsukura, H. Ohno
  • Organizer: 24th International Colloquium on Magnetic Films and Surfaces (ICMFS-2022), Okinawa Institute of Science and Technology Graduate University (OIST)
  • Int'l Joint Research
• [Presentation] Dot size dependence of thermal stability in non-collinear antiferromagnet Mn3Sn (2022)
  • Author(s): Y. Sato, Y. Takeuchi, Y. Yamane, J. Yoon, S. Kanai, J. Ieda, H. Ohno and S. Fukami
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学（仙台）＋online
• [Presentation] Stochastic magnetic tunnel junctions with double free layers (2022)
  • Author(s): R. Ota, K. Kobayashi, K. Hayakawa, S. Kanai, K. Camsari, H. Ohno and S. Fukami
  • Organizer: 第83回応用物理学会秋季学術講演会, 東北大学（仙台）＋online
• [Remarks] 東北大学 電気通信研究所 深見・金井研究室
  • URL: http://www.spin.riec.tohoku.ac.jp/index.html